![]() ![]() The study, published Wednesday in the New England Journal of Medicine, also found that different coronavirus strains produce about the same amount of the virus, which hadn’t been clear before. Usually, we only see the virus once a person has symptoms, when they're at peak." "This allowed us to uncover what infections look like in the very early stages. ![]() Chan School of Public Health and co-author on the paper. "Most of them were getting tested every day or every other day," said Stephen Kissler, an infectious disease fellow at the Harvard T.H. The researchers took 19,941 viral samples from 173 National Basketball Association players, staff and their families between November 2020 and August. They compared the viral dynamics of those infected with various coronavirus variants and the course of illness in players who were vaccinated and unvaccinated. The study, which involved NBA players, their families and staff, found that people with breakthrough COVID-19 cases stopped producing the virus two days sooner than the unvaccinated. The vaccinated people who got COVID-19 cleared the virus from their systems on average in 5½ days. New research about breakthrough coronavirus infections finds they may be less likely to spread to others because vaccinated people don't shed the virus for as long as the unvaccinated. It would need to be packaged inside a live virus, which our vaccines don’t contain.Watch Video: Moderna: Vaccine protection waned amid delta surge Again, the mRNA wouldn’t be enough to cause an infection. For that you need the entire virus, which the vaccines don’t contain.Īnd the mRNA in the Pfizer and Moderna vaccines is very short-lived, and is quickly degraded in our cells. They contain fragments of spike protein or the instructions on how to make it.Įven if you could shed spike protein after vaccination, that wouldn’t be enough to cause an infection. What's the difference between viral shedding and reinfection with COVID-19?ĬOVID vaccines don’t give you the disease or give you a positive COVID test. Once inside your cells, your body uses those instructions to make spike protein, again raising a protective immune response. The Pfizer vaccine is an mRNA vaccine, which contains the genetic material to code for the spike protein. Your body then uses these instructions to make the spike protein, and to raise a protective immune response. This uses a modified chimpanzee virus to carry into the body the genetic instructions to produce the SARS-CoV-2 spike protein. Instead, they use other technologies to train our bodies to recognise SARS-CoV-2 and to mount a protective immune response should we ever be exposed to it.įor instance, the AstraZeneca vaccine is a viral vector vaccine. However, none of the COVID vaccines approved for use anywhere around the world so far use live virus. ![]() The majority of people infected this way had a weakened immune system.Įxplainer: how do you get shingles and who should be vaccinated against it?ĬOVID vaccines don’t contain live virus to shed However, this happened in less than 1% out of more than 20,000 people vaccinated over a ten-year period. These train your body to mount an immune response with a version of the virus that isn’t so dangerous.įor example, with the very effective vaccine against herpes zoster (shingles), there is a very small risk the weakened virus can cause infection. Examples are vaccines against measles, rubella, mumps and herpes zoster (shingles). Some vaccines for other diseases contain live viruses that have been weakened ( or attenuated). We don't know for sure if coronavirus can spread through poo, but it's possible We can only infect someone if the virus is live. During the pandemic, that’s why we socially distance, wear masks and stay at home if we’re sick. If people are infected, they can shed virus via their respiratory secretions when they cough and sneeze. People can shed (or release) virus after a viral infection, such as SARS-CoV-2, the virus that causes COVID-19. ![]()
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